111445961 has 32 divisors (see below), whose sum is σ = 131736576. Its totient is φ = 94089600.

The previous prime is 111445933. The next prime is 111445969. The reversal of 111445961 is 169544111.

It is a de Polignac number, because none of the positive numbers 2^k-111445961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111445969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1526621 + ... + 1526693.

It is an arithmetic number, because the mean of its divisors is an integer number (4116768).

Almost surely, 2^111445961 is an apocalyptic number.

111445961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111445961 is a deficient number, since it is larger than the sum of its proper divisors (20290615).

111445961 is an equidigital number, since it uses as much as digits as its factorization.

111445961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 152 counting only the distinct ones).

The product of its digits is 4320, while the sum is 32.

The square root of 111445961 is about 10556.7969100480. The cubic root of 111445961 is about 481.2323095538.

The spelling of 111445961 in words is "one hundred eleven million, four hundred forty-five thousand, nine hundred sixty-one".